Good thoughts but I don't think so. Don doesn't seem to contemplate things that deeply when it comes to the domestic front. He's far more concerned with the effect of her words on him and then the kids than why she said those words. He's more reactive than proactive. IMHO.

If he finds out, either by Betty telling him or other means, that Henry's the one, I suspect he won't be mean or cruel to either Betty or Henry. That would not be in his nature. (The "meanest" deliberate thing we've seen him do is take revenge on Roger after he made a pass at Betty.) Don would find a way to mentally cut Betty out of his, and the kids, life. And move forward. The opposite of love is not hate. It is indifference.

BTW, he may not have slept at night with Rachel or Bobbie but he certainly did with Midge and more than once over at least five years.

I'm not sure Don has a jealous bone in his body. I also get the feeling that Don doesn't feel he deserves the beautiful wife, kids, home, car, career and all the trappings. He's still very rooted in the past no matter how much he struggles to make it disappear. When he was watching Betty serving breakfast to the kids, as if watching a TV commercial, you could tell he felt like the outsider who just can't quite be where they are.
If Don does any fighting, it will be for his kids, because I think he loves them more than he loves Betty and anything else he has. Don wants the perfect family but he just keeps sabotaging himself until he ends up alone.

Test

Loves Mad Men -
Ahh... yeah... sure. Treat her like a queen and she'll blossom. No doubt. Works every time. Better yet, a princess.

Queens have to do yucky things. Like be a parent, rule her queendom and occasionally say, "Off with his head." Princesses like Betty just have to be beautiful and accept her subjects' unconditional devotion.

Don is arrogant and he is dumber than you think. He stupidly doesn't realize that the rotten way he treats people will come back and kick him in the teeth in the future. He is sooooo arrogant with that ugly hippie teacher. She's a teacher at his kids school. She's nuts in the head and he seems to like nutty ugly women.

@Loves Mad Men: If the folks here are assholes, why do you post here? Isn't there somewhere else you could go?

Come to think of it, it WOULD seem pretty suspicious her telling him I don't love you as soon as she gets back from her drive alone.

And also who's to say that Don didn't follow her. Remember when she got back Don said that Francine had the kids. Maybe he sent them there so he could follow her.

Checked IMDB and Henry is in this last episode. Also I think the city jail is in this epi. so maybe Don cleans Henry's clock and goes to the hoosgow.

The farmer in this epi. is not Archie.